drm/exynos/decon5433: add PCLK clock

PCLK clock is used by DECON IP. The patch also replaces magic number with
number of clocks in array definition.
Signed-off-by: NAndrzej Hajda <a.hajda@samsung.com>
Signed-off-by: NInki Dae <inki.dae@samsung.com>

drivers/gpu/drm/exynos/exynos5433_drm_decon.c

@@ -27,13 +27,23 @@
 #define CURSOR_WIN	2
 #define MIN_FB_WIDTH_FOR_16WORD_BURST	128
 
+static const char * const decon_clks_name[] = {
+	"pclk",
+	"aclk_decon",
+	"aclk_smmu_decon0x",
+	"aclk_xiu_decon0x",
+	"pclk_smmu_decon0x",
+	"sclk_decon_vclk",
+	"sclk_decon_eclk",
+};
+
 struct decon_context {
 	struct device			*dev;
 	struct drm_device		*drm_dev;
 	struct exynos_drm_crtc		*crtc;
 	struct exynos_drm_plane		planes[WINDOWS_NR];
 	void __iomem			*addr;
-	struct clk			*clks[6];
+	struct clk			*clks[ARRAY_SIZE(decon_clks_name)];
 	unsigned long			irq_flags;
 	int				pipe;
 	bool				suspended;
@@ -45,15 +55,6 @@ struct decon_context {
 	atomic_t			win_updated;
 };
 
-static const char * const decon_clks_name[] = {
-	"aclk_decon",
-	"aclk_smmu_decon0x",
-	"aclk_xiu_decon0x",
-	"pclk_smmu_decon0x",
-	"sclk_decon_vclk",
-	"sclk_decon_eclk",
-};
-
 static const uint32_t decon_formats[] = {
 	DRM_FORMAT_XRGB1555,
 	DRM_FORMAT_RGB565,