Replace Cortex A15 strlen implementation with cortex-strings

Benchmarks on a Nexus 10 have shown this implementation to be 5%-20%
faster (depending on input)

Change-Id: I4331a390c404a77b1e13909d713c4258a3776bca
Signed-off-by: Bernhard Rosenkraenzer <Bernhard.Rosenkranzer@linaro.org>
Import memchr implementation from cortex-strings for Cortex A15

Benchmarks on a Nexus 10 have shown the cortex-strings implementation
of memchr to be 60%-70% faster (depending on input)

Change-Id: I525587d8663c881e9059b26b19409b0c563b2a18
Signed-off-by: Bernhard Rosenkraenzer <Bernhard.Rosenkranzer@linaro.org>

Conflicts:
	libc/arch-arm/cortex-a15/cortex-a15.mk
	libc/arch-arm/generic/generic.mk
Replace memcpy with the cortex-strings implementation

Benchmarks on a Nexus 10 have shown this implementation to be
up to 12% faster.

Change-Id: Ida882cc6a583dfd00c3659b022c26070665824af
Signed-off-by: Bernhard Rosenkränzer <Bernhard.Rosenkranzer@linaro.org>