makefile: disable some clang spam

Signed-off-by: engstk <[email protected]>

Makefile

@@ -519,7 +519,8 @@ KBUILD_CFLAGS   := -Wall -Wundef -Werror=strict-prototypes -Wno-trigraphs \
 		   -mcpu=cortex-a55 -fdiagnostics-color=always -pipe \
 		   -Wno-void-pointer-to-enum-cast -Wno-misleading-indentation -Wno-unused-function -Wno-bool-operation \
 		   -Wno-unsequenced -Wno-void-pointer-to-int-cast -Wno-unused-variable -Wno-pointer-to-int-cast -Wno-pointer-to-enum-cast \
-		   -Wno-fortify-source -Wno-strlcpy-strlcat-size -Wno-unused-result -Wno-deprecated-declarations
+		   -Wno-fortify-source -Wno-strlcpy-strlcat-size -Wno-unused-result -Wno-deprecated -Wno-deprecated-declarations \
+		   -Wformat=0
 
 KBUILD_CPPFLAGS := -D__KERNEL__
 KBUILD_AFLAGS_KERNEL :=