boards/imx93-evk: disable work queues in bootloader

The bootloader image has no linked HPWORK or LPWORK consumers, but
enabling both queues pulls unused scheduler code into its constrained
OCRAM region.

Disable the predefined work queues and let deferred memory reclamation
fall back to the idle thread.

Assisted-by: Codex:GPT-5
Signed-off-by: DuoYuWang <thirteenking.wang@gmail.com>

Author: 13022591351

boards/arm64/imx9/imx93-evk/configs/bootloader/defconfig

@@ -107,10 +107,6 @@ CONFIG_READLINE_CMD_HISTORY=y
 CONFIG_READLINE_CMD_HISTORY_LEN=16
 CONFIG_READLINE_CMD_HISTORY_LINELEN=80
 CONFIG_RR_INTERVAL=200
-CONFIG_SCHED_HPWORK=y
-CONFIG_SCHED_HPWORKPRIORITY=192
-CONFIG_SCHED_LPWORK=y
-CONFIG_SCHED_LPWORKPRIORITY=50
 CONFIG_SIG_PREALLOC_IRQ_ACTIONS=8
 CONFIG_SPINLOCK=y
 CONFIG_STACK_COLORATION=y