cmake: mwdt assembler option for imacros

Add the -imacros property for assembler language to compensate
for changes introduced in PR zephyrproject-rtos#84800.

(cherry picked from commit 36a599f)

Original-Signed-off-by: Björn Bergman <[email protected]>
GitOrigin-RevId: 36a599f
Cr-Build-Id: 8722485936012132001
Cr-Build-Url: https://cr-buildbucket.appspot.com/build/8722485936012132001
Copybot-Job-Name: zephyr-main-copybot-downstream
Change-Id: I2740d563792e682df058a8ddc9fb9c93cc6e47f2
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/third_party/zephyr/+/6281753
Bot-Commit: ChromeOS Prod (Robot) <[email protected]>
Commit-Queue: ChromeOS Prod (Robot) <[email protected]>
Tested-by: ChromeOS Prod (Robot) <[email protected]>

Author: Björn Bergman

cmake/compiler/arcmwdt/compiler_flags.cmake

@@ -165,6 +165,9 @@ set_compiler_property(PROPERTY coverage "")
 # mwdt compiler flags for imacros. The specific header must be appended by user.
 set_compiler_property(PROPERTY imacros -imacros)
 
+# assembler compiler flags for imacros. The specific header must be appended by user.
+set_property(TARGET asm PROPERTY imacros -imacros)
+
 # Security canaries.
 #no support of -mstack-protector-guard=global"
 set_compiler_property(PROPERTY security_canaries -fstack-protector)