ARM: 8535/1: mm: DEBUG_RODATA makes no sense with XIP_KERNEL

When CONFIG_DEBUG_ALIGN_RODATA is set, we get a link error:

arch/arm/mm/built-in.o:(.data+0x4bc): undefined reference to `__start_rodata_section_aligned'

However, this combination is useless, as XIP_KERNEL implies that all the
RODATA is already marked readonly, so both CONFIG_DEBUG_RODATA and
CONFIG_DEBUG_ALIGN_RODATA (which depends on the other) are not
needed with XIP_KERNEL, and this patches enforces that using a Kconfig
dependency.
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Fixes: 25362dc4 ("ARM: 8501/1: mm: flip priority of CONFIG_DEBUG_RODATA")
Acked-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

arch/arm/mm/Kconfig

@@ -1039,7 +1039,7 @@ config ARCH_SUPPORTS_BIG_ENDIAN
 
 config DEBUG_RODATA
 	bool "Make kernel text and rodata read-only"
-	depends on MMU
+	depends on MMU && !XIP_KERNEL
 	default y if CPU_V7
 	help
 	  If this is set, kernel text and rodata memory will be made