denver: use plat_my_core_pos() to get core position

The current functions to disable and enable Dynamic Code Optimizer
(DCO) assume that all denver cores are in the same cluster. They
ignore AFF1 field of the mpidr_el1 register, which leads to
incorect logical core id calculation.

This patch calls the platform handler, plat_my_core_pos(), to get
the logical core id to disable/enable DCO for the core.

Original change by: Krishna Sitaraman <ksitaraman@nvidia.com>

Change-Id: I45fbd1f1eb032cc1db677a4fdecc554548b4a830
Signed-off-by: Varun Wadekar <vwadekar@nvidia.com>

lib/cpus/aarch64/denver.S

@@ -156,11 +156,12 @@ endfunc denver_disable_ext_debug
 	 * ----------------------------------------------------
 	 */
 func denver_enable_dco
-	mrs	x0, mpidr_el1
-	and	x0, x0, #0xF
+	mov	x3, x30
+	bl	plat_my_core_pos
 	mov	x1, #1
 	lsl	x1, x1, x0
 	msr	s3_0_c15_c0_2, x1
+	mov	x30, x3
 	ret
 endfunc denver_enable_dco
 
@@ -170,9 +171,10 @@ endfunc denver_enable_dco
 	 */
 func denver_disable_dco
 
+	mov	x3, x30
+
 	/* turn off background work */
-	mrs	x0, mpidr_el1
-	and	x0, x0, #0xF
+	bl	plat_my_core_pos
 	mov	x1, #1
 	lsl	x1, x1, x0
 	lsl	x2, x1, #16
@@ -186,6 +188,7 @@ func denver_disable_dco
 	and	x2, x2, x1
 	cbnz	x2, 1b
 
+	mov	x30, x3
 	ret
 endfunc denver_disable_dco