remoteproc/mediatek: fix sparse errors on sram power on and off

Fixes the following sparse errors on sram power on and off:

On drivers/remoteproc/mtk_scp.c:306:17:
warning: incorrect type in argument 2 (different address spaces)
   expected void volatile [noderef] __iomem *addr
   got void *addr

On drivers/remoteproc/mtk_scp.c:307:9:
warning: incorrect type in argument 2 (different address spaces)
   expected void volatile [noderef] __iomem *addr
   got void *addr

On drivers/remoteproc/mtk_scp.c:314:9:
warning: incorrect type in argument 2 (different address spaces)
   expected void volatile [noderef] __iomem *addr
   got void *addr

On drivers/remoteproc/mtk_scp.c:316:17:
warning: incorrect type in argument 2 (different address spaces)
   expected void volatile [noderef] __iomem *addr
   got void *addr
Reviewed-by: NNicolas Boichat <drinkcat@chromium.org>
Reviewed-by: NMathieu Poirier <mathieu.poirier@linaro.org>
Reported-by: Nkernel test robot <lkp@intel.com>
Signed-off-by: NTzung-Bi Shih <tzungbi@google.com>
Link: https://lore.kernel.org/r/20201116082537.3287009-2-tzungbi@google.comSigned-off-by: NBjorn Andersson <bjorn.andersson@linaro.org>

drivers/remoteproc/mtk_scp.c

@@ -298,7 +298,7 @@ static int mt8183_scp_before_load(struct mtk_scp *scp)
 	return 0;
 }
 
-static void mt8192_power_on_sram(void *addr)
+static void mt8192_power_on_sram(void __iomem *addr)
 {
 	int i;
 
@@ -307,7 +307,7 @@ static void mt8192_power_on_sram(void *addr)
 	writel(0, addr);
 }
 
-static void mt8192_power_off_sram(void *addr)
+static void mt8192_power_off_sram(void __iomem *addr)
 {
 	int i;