drm/gma500: remove set but not used variable 'is_hdmi','is_crt'

Fixes gcc '-Wunused-but-set-variable' warning:

drivers/gpu/drm/gma500/cdv_intel_display.c: In function cdv_intel_crtc_mode_set:
drivers/gpu/drm/gma500/cdv_intel_display.c:594:7: warning: variable is_hdmi set but not used [-Wunused-but-set-variable]
drivers/gpu/drm/gma500/cdv_intel_display.c: In function cdv_intel_crtc_mode_set:
drivers/gpu/drm/gma500/cdv_intel_display.c:593:7: warning: variable is_crt set but not used [-Wunused-but-set-variable]

They are not used since commit acd7ef92 ("gma500:
Update the Cedarview clock handling")
Reported-by: Hulk Robot <hulkci@huawei.com>
Signed-off-by: zhengbin <zhengbin13@huawei.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: https://patchwork.freedesktop.org/patch/msgid/1573828027-122323-4-git-send-email-zhengbin13@huawei.com

drivers/gpu/drm/gma500/cdv_intel_display.c

@@ -582,8 +582,8 @@ static int cdv_intel_crtc_mode_set(struct drm_crtc *crtc,
 	struct gma_clock_t clock;
 	u32 dpll = 0, dspcntr, pipeconf;
 	bool ok;
-	bool is_crt = false, is_lvds = false, is_tv = false;
-	bool is_hdmi = false, is_dp = false;
+	bool is_lvds = false, is_tv = false;
+	bool is_dp = false;
 	struct drm_mode_config *mode_config = &dev->mode_config;
 	struct drm_connector *connector;
 	const struct gma_limit_t *limit;
@@ -607,10 +607,7 @@ static int cdv_intel_crtc_mode_set(struct drm_crtc *crtc,
 			is_tv = true;
 			break;
 		case INTEL_OUTPUT_ANALOG:
-			is_crt = true;
-			break;
 		case INTEL_OUTPUT_HDMI:
-			is_hdmi = true;
 			break;
 		case INTEL_OUTPUT_DISPLAYPORT:
 			is_dp = true;