drm/xe/display: fix type of intel_uncore_read*() functions

Some of the backported intel_uncore_read*() functions used the wrong
types.  Change the function declarations accordingly.
Reviewed-by: Gustavo Sousa <gustavo.sousa@intel.com>
Signed-off-by: Luca Coelho <luciano.coelho@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20240314065221.1181158-1-luciano.coelho@intel.comSigned-off-by: Jani Nikula <jani.nikula@intel.com>

drivers/gpu/drm/xe/compat-i915-headers/intel_uncore.h

@@ -25,7 +25,7 @@ static inline u32 intel_uncore_read(struct intel_uncore *uncore,
 	return xe_mmio_read32(__compat_uncore_to_gt(uncore), reg);
 }
 
-static inline u32 intel_uncore_read8(struct intel_uncore *uncore,
+static inline u8 intel_uncore_read8(struct intel_uncore *uncore,
 				    i915_reg_t i915_reg)
 {
 	struct xe_reg reg = XE_REG(i915_mmio_reg_offset(i915_reg));
@@ -33,7 +33,7 @@ static inline u32 intel_uncore_read8(struct intel_uncore *uncore,
 	return xe_mmio_read8(__compat_uncore_to_gt(uncore), reg);
 }
 
-static inline u32 intel_uncore_read16(struct intel_uncore *uncore,
+static inline u16 intel_uncore_read16(struct intel_uncore *uncore,
 				      i915_reg_t i915_reg)
 {
 	struct xe_reg reg = XE_REG(i915_mmio_reg_offset(i915_reg));