Merge pull request #848 from douglas-raillard-arm/dr/improve_errata_doc

Clarify errata ERRATA_A53_836870 documentation

docs/cpu-specific-build-macros.md

@@ -58,7 +58,7 @@ For Cortex-A53, following errata build flags are defined :
 
 *   `ERRATA_A53_836870`: This applies errata 836870 workaround to Cortex-A53
      CPU. This needs to be enabled only for revision <= r0p3 of the CPU. From
-     r0p4 and onwards, this errata is enabled by default.
+     r0p4 and onwards, this errata is enabled by default in hardware.
 
 For Cortex-A57, following errata build flags are defined :
 

lib/cpus/cpu-ops.mk

@@ -63,7 +63,7 @@ ERRATA_A53_826319	?=0
 
 # Flag to apply erratum 836870 workaround during reset. This erratum applies
 # only to revision <= r0p3 of the Cortex A53 cpu. From r0p4 and onwards, this
-# erratum workaround is enabled by default.
+# erratum workaround is enabled by default in hardware.
 ERRATA_A53_836870	?=0
 
 # Flag to apply erratum 806969 workaround during reset. This erratum applies