mx7ulp: Select the SCG1 APLL PFD as a system clock source

Due to the APLL out glitch issue, the APLLCFG PLLS bit must
be set to select SCG1 APLL PFD for generating system clock to align
with the design.

Signed-off-by: Ye Li <ye.li@nxp.com>
Acked-by: Peng Fan <peng.fan@nxp.com>
diff --git a/board/freescale/mx7ulp_evk/imximage.cfg b/board/freescale/mx7ulp_evk/imximage.cfg
index d4f6c3c..6bc7c19 100644
--- a/board/freescale/mx7ulp_evk/imximage.cfg
+++ b/board/freescale/mx7ulp_evk/imximage.cfg
@@ -45,7 +45,7 @@
 DATA 4   0x403e0040 0x01000020
 DATA 4   0x403e0500 0x01000000
 DATA 4   0x403e050c 0x80808080
-DATA 4   0x403e0508 0x00160000
+DATA 4   0x403e0508 0x00160002
 DATA 4   0x403E0510 0x00000002
 DATA 4   0x403E0514 0x00000005
 DATA 4   0x403e0500 0x00000001
diff --git a/board/freescale/mx7ulp_evk/plugin.S b/board/freescale/mx7ulp_evk/plugin.S
index ccd2fc0..55dfecc 100644
--- a/board/freescale/mx7ulp_evk/plugin.S
+++ b/board/freescale/mx7ulp_evk/plugin.S
@@ -18,7 +18,7 @@
 
 	ldr r3, =0x80808080
 	str r3, [r2, #0x50c]
-	ldr r3, =0x00160000
+	ldr r3, =0x00160002
 	str r3, [r2, #0x508]
 	ldr r3, =0x00000002
 	str r3, [r2, #0x510]