drm/komeda: Fix potential integer overflow in komeda_crtc_update_clock_ratio

Add suffix ULL to constant 1000 in order to avoid a potential integer
overflow and give the compiler complete information about the proper
arithmetic to use. Notice that this constant is being used in a context
that expects an expression of type u64, but it's currently evaluated
using 32-bit arithmetic.

Addresses-Coverity-ID: 1485796 ("Unintentional integer overflow")
Fixes: ed22c6d9304d ("drm/komeda: Use drm_display_mode "crtc_" prefixed hardware timings")
Signed-off-by: Gustavo A. R. Silva <[e-mail]>
Reviewed-by: James Qian Wang (Arm Technology China) <[e-mail]>
Signed-off-by: james qian wang (Arm Technology China) <[e-mail]>
Link: https://patchwork.freedesktop.org/patch/msgid/20190812000801.GA29204@embeddedor

drivers/gpu/drm/arm/display/komeda/komeda_crtc.c

···
 		return;
 	}
 
-	pxlclk = kcrtc_st->base.adjusted_mode.crtc_clock * 1000;
+	pxlclk = kcrtc_st->base.adjusted_mode.crtc_clock * 1000ULL;
 	aclk = komeda_crtc_get_aclk(kcrtc_st);
 
 	kcrtc_st->clock_ratio = div64_u64(aclk << 32, pxlclk);