chip/mt8192_scp: enlarge the stack size of idle task
chip/mt8192_scp: enlarge the stack size of idle task

Enlarges the stack size of idle task from 256 to 640.

BRANCH=none
BUG=b:163459890
TEST=$ r() {
    echo stop >/sys/class/remoteproc/remoteproc0/state
    echo start >/sys/class/remoteproc/remoteproc0/state
}
$ r
$ r

Signed-off-by: Tzung-Bi Shih <5e6f7578cd434ae5b4c9ffe5250f7a87a25045d7@chromium.org>
Change-Id: I6d887262f39ff32bdb1b86aba59759917a0a95d1
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/ec/+/2351640
Reviewed-by: Ting Shen <c671d3efec3d7e7e285f3788bf0d1ba4c8605b78@chromium.org>
Reviewed-by: Nicolas Boichat <f3daba1cdc403799935674d3cd4b0e5bd1804232@chromium.org>

coreboot/chrome-ec,coreboot/chrome-ec,coreboot/chrome-ec,coreboot/chrome-ec,coreboot/chrome-ec,coreboot/chrome-ec