armv6: p15 cache functions say that value passed in should be zero

@@ -187,21 +187,24 @@
         bic     r0, #0x4
         mcr     p15, 0, r0, c1, c0, 0
         SET_SIZE(armv6_dcache_disable)
 
         ENTRY(armv6_icache_inval)
+        mov     r0, #0
         mcr     p15, 0, r0, c7, c5, 0           @ Invalidate i-cache
         bx      lr
         SET_SIZE(armv6_icache_inval)
 
         ENTRY(armv6_dcache_inval)
+        mov     r0, #0
         mcr     p15, 0, r0, c7, c6, 0           @ Invalidate d-cache
         ARM_DSB_INSTR(r2)
         bx      lr
         SET_SIZE(armv6_dcache_inval)
 
         ENTRY(armv6_dcache_flush)
+        mov     r0, #0
         mcr     p15, 0, r0, c7, c10, 4          @ Flush d-cache
         ARM_DSB_INSTR(r2)
         bx      lr
         SET_SIZE(armv6_dcache_flush)
         

@@ -214,10 +217,11 @@
         ARM_ISB_INSTR(r2)
         bx      lr
         SET_SIZE(armv6_text_flush_range)
 
         ENTRY(armv6_text_flush)
+        mov     r0, #0
         mcr     p15, 0, r0, c7, c5, 0           @ Invalidate i-cache
         mcr     p15, 0, r0, c7, c10, 4          @ Flush d-cache
         ARM_DSB_INSTR(r2)
         ARM_ISB_INSTR(r2)
         bx      lr