ARM: omap2: fix am43xx build without L2X0

When CONFIG_CACHE_L2X0 is disabled, the am43xx specific suspend
implemnentation fails to link:

arch/arm/mach-omap2/sleep43xx.o: In function `get_l2cache_base':
(.text+0x180): undefined reference to `omap4_get_l2cache_base'

This adds an #ifdef protection around the code, like we do for am44xx.

Fixes: 41d37e61372f ("ARM: OMAP2+: Introduce low-level suspend code for AM43XX")
Acked-by: Tony Lindgren <tony@atomide.com>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>

arch/arm/mach-omap2/sleep43xx.S

@@ -52,10 +52,12 @@
 ENTRY(am43xx_do_wfi)
 	stmfd	sp!, {r4 - r11, lr}	@ save registers on stack
 
+#ifdef CONFIG_CACHE_L2X0
 	/* Retrieve l2 cache virt address BEFORE we shut off EMIF */
 	ldr	r1, get_l2cache_base
 	blx	r1
 	mov	r8, r0
+#endif
 
 	/*
 	 * Flush all data from the L1 and L2 data cache before disabling
@@ -334,8 +336,6 @@ ENDPROC(am43xx_resume_from_deep_sleep)
 	.align
 resume_addr:
 	.word	cpu_resume - PAGE_OFFSET + 0x80000000
-get_l2cache_base:
-	.word	omap4_get_l2cache_base
 kernel_flush:
 	.word   v7_flush_dcache_all
 ddr_start:
@@ -354,7 +354,10 @@ am43xx_phys_emif_clkctrl:
 	.word	(AM43XX_CM_BASE + AM43XX_CM_PER_INST + \
 		 AM43XX_CM_PER_EMIF_CLKCTRL_OFFSET)
 
+#ifdef CONFIG_CACHE_L2X0
 /* L2 cache related defines for AM437x */
+get_l2cache_base:
+	.word	omap4_get_l2cache_base
 l2_cache_base:
 	.word	OMAP44XX_L2CACHE_BASE
 l2_smc1:
@@ -365,6 +368,7 @@ l2_smc3:
 	.word	OMAP4_MON_L2X0_CTRL_INDEX
 l2_val:
 	.word	0xffff
+#endif
 
 .align 3
 /* DDR related defines */