boards: fvp_baser_aemv8r: Remove the ISR_STACKS_SIZE

Fix tests by removing the CONFIG_ISR_STACKS_SIZE. The defaut is 4096.

Signed-off-by: Jaxson Han <[email protected]>

Author: povergoing

boards/arm64/fvp_baser_aemv8r/fvp_baser_aemv8r_smp_defconfig

@@ -8,7 +8,6 @@ CONFIG_BOARD_FVP_BASER_AEMV8R=y
 # Cache management
 CONFIG_CACHE_MANAGEMENT=y
 
-CONFIG_ISR_STACK_SIZE=1024
 CONFIG_THREAD_STACK_INFO=y
 
 # Enable Timer and Sys clock