ARC: Fix STR macro for ST* asm instructions

For case of 64-bit arc_v3 architecture "str" macro handles large
offsets in incorrrect way. For stl instruction limm swhoud not exceed 255.

Signed-off-by: Nikolay Agishev <[email protected]>

Author: Nikolay Agishev

include/zephyr/arch/arc/asm-compat/asm-macro-64-bit-gnu.h

@@ -34,7 +34,7 @@
 	.if \off == 0
 		stl \d, [\s]
 	.else
-		.if \off > 256
+		.if \off > 255
 			STR.as \d, \s, \off / 8
 		.else
 			stl    \d, [\s, \off]