drm/i915/lspcon: switch to kernel unsigned int types

We have fairly mixed uintN_t vs. uN usage throughout the driver, but try
to stick to kernel types at least where it's more prevalent.
Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/1e132575785d9b615208eb60ee5e388df5991172.1528794959.git.jani.nikula@intel.com

drivers/gpu/drm/i915/intel_lspcon.c

@@ -116,7 +116,7 @@ static int lspcon_change_mode(struct intel_lspcon *lspcon,
 
 static bool lspcon_wake_native_aux_ch(struct intel_lspcon *lspcon)
 {
-	uint8_t rev;
+	u8 rev;
 
 	if (drm_dp_dpcd_readb(&lspcon_to_intel_dp(lspcon)->aux, DP_DPCD_REV,
 			      &rev) != 1) {