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

*** 187,207 ****
--- 187,210 ----
          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)
          
*** 214,223 ****
--- 217,227 ----
          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