Revert "ARM: dts: msm: i2c: change clock rate to 19.2 MHz"

This reverts commit 8c029b316aa37ab9e3061808805c372bfacf742c.
Revert "arch/arm/boot/dts/msm8974.dtsi: set other i2c clocks to 19.2 MHz as well"

This reverts commit 8f7d8da8a1c31939af55753fa21874bb124982f9.
Revert "defconfig: add memcpy optimizations by nvidia"

This reverts commit 414da33640a99c71afd45fbd91b7f03f9c50068f.

Conflicts:
	arch/arm/configs/elementalx_defconfig
revert "arch: arm: lib: optimize memcpy for cortex-A15"

This reverts commit de68283567a40d06058d3e1b0402675121e50cc0.