Summary

An extra lock appears in imxrt_edma due to 2 conflicting PRs:

This PR removes the extra lock in imxrt_edma.

Impact

This PR will fix the imxrt_edma errors reported by nuttx-dashboard.org

Testing

Before this PR

teensy-4.x:lcd-4.1 fails to build due to duplicate lock:
https://github.com/NuttX/nuttx/actions/runs/12545164788/job/34978997451#step:7:749

Configuration/Tool: teensy-4.x/lcd-4.1,CONFIG_ARM_TOOLCHAIN_GNU_EABI
Error: chip/imxrt_edma.c:148:14: error: duplicate member 'lock'
  148 |   spinlock_t lock;                /* Spinlock */
      |              ^~~~

imxrt1064-evk:lvgl also fails to build due to duplicate lock:
https://github.com/NuttX/nuttx/actions/runs/12545164788/job/34978997451#step:7:814

Configuration/Tool: imxrt1064-evk/lvgl,CONFIG_ARM_TOOLCHAIN_GNU_EABI
Error: chip/imxrt_edma.c:148:14: error: duplicate member 'lock'
  148 |   spinlock_t lock;                /* Spinlock */
      |              ^~~~

After this PR

teensy-4.x:lcd-4.1 builds successfully in Docker:
https://gist.github.com/lupyuen/649f3fae1649f33570e0ce6a96bb497b

sudo docker run \
  -it \
  ghcr.io/apache/nuttx/apache-nuttx-ci-linux:latest \
  /bin/bash
cd
git clone https://github.com/lupyuen2/wip-nuttx nuttx --branch imxrt_edma
git clone https://github.com/apache/nuttx-apps apps
pushd nuttx ; echo NuttX Source: https://github.com/apache/nuttx/tree/$(git rev-parse HEAD) ; popd
pushd apps  ; echo NuttX Apps: https://github.com/apache/nuttx-apps/tree/$(git rev-parse HEAD) ; popd
cd nuttx
tools/configure.sh teensy-4.x:lcd-4.1
make -j
Memory region         Used Size  Region Size  %age Used
           flash:      111572 B      1984 KB      5.49%
            sram:       12676 B       512 KB      2.42%
            itcm:          0 GB       512 KB      0.00%
            dtcm:          0 GB       512 KB      0.00%
CP: nuttx.hex

imxrt1064-evk:lvgl also builds successfully in Docker:
https://gist.github.com/lupyuen/4aa7830fa50d12d771567db16d64af8e

sudo docker run \
  -it \
  ghcr.io/apache/nuttx/apache-nuttx-ci-linux:latest \
  /bin/bash
cd
git clone https://github.com/lupyuen2/wip-nuttx nuttx --branch imxrt_edma
git clone https://github.com/apache/nuttx-apps apps
pushd nuttx ; echo NuttX Source: https://github.com/apache/nuttx/tree/$(git rev-parse HEAD) ; popd
pushd apps  ; echo NuttX Apps: https://github.com/apache/nuttx-apps/tree/$(git rev-parse HEAD) ; popd
cd nuttx
tools/configure.sh imxrt1064-evk/lvgl
make -j
Memory region         Used Size  Region Size  %age Used
           flash:      464796 B         4 MB     11.08%
            sram:        9180 B       512 MB      0.00%
            itcm:          0 GB       128 KB      0.00%
            dtcm:          0 GB       128 KB      0.00%
CP: nuttx.hex
CP: nuttx.srec