drm/msm: Use nvmem_cell_read_variable_le_u32() to read speed bin

Let's use the newly-added nvmem_cell_read_variable_le_u32() to future
proof ourselves a little bit.
Signed-off-by: Douglas Anderson <dianders@chromium.org>
Link: https://lore.kernel.org/r/20210521134516.v2.1.Id496c6fea0cb92ff6ea8ef1faf5d468eb09465e3@changeidReviewed-by: Stephen Boyd <swboyd@chromium.org>
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Signed-off-by: Rob Clark <robdclark@chromium.org>

drivers/gpu/drm/msm/adreno/a6xx_gpu.c

@@ -1724,10 +1724,10 @@ static u32 fuse_to_supp_hw(struct device *dev, struct adreno_rev rev, u32 fuse)
 static int a6xx_set_supported_hw(struct device *dev, struct adreno_rev rev)
 {
 	u32 supp_hw = UINT_MAX;
-	u16 speedbin;
+	u32 speedbin;
 	int ret;
 
-	ret = nvmem_cell_read_u16(dev, "speed_bin", &speedbin);
+	ret = nvmem_cell_read_variable_le_u32(dev, "speed_bin", &speedbin);
 	/*
 	 * -ENOENT means that the platform doesn't support speedbin which is
 	 * fine
@@ -1740,7 +1740,6 @@ static int a6xx_set_supported_hw(struct device *dev, struct adreno_rev rev)
 			      ret);
 		goto done;
 	}
-	speedbin = le16_to_cpu(speedbin);
 
 	supp_hw = fuse_to_supp_hw(dev, rev, speedbin);