ARM: 6755/1: omap4: l2x0: Populate set_debug() function and enable Errata 727915

ARM: 6755/1: omap4: l2x0: Populate set_debug() function and enable Errata 727915

Populate the l2x0 set_debug function pointer with OMAP secure call
and enable the PL310 Errata 727915

This patch has dependency on the earlier patch
ARM: l2x0: Errata fix for flush by Way operation can cause data
corruption

Signed-off-by: Santosh Shilimkar <santosh.shilimkar@ti.com>
Reviewed-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>