usb: isp1760: use relaxed primitives

Use io relaxed access memory primitives to satisfy strict type
checking (__force).

This will fix some existing sparse warnings:
sparse: warning: cast to restricted __le32
Signed-off-by: Rui Miguel Silva <rui.silva@linaro.org>
Link: https://lore.kernel.org/r/20210513084717.2487366-4-rui.silva@linaro.orgSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/usb/isp1760/isp1760-hcd.c

@@ -246,7 +246,7 @@ static void bank_reads8(void __iomem *src_base, u32 src_offset, u32 bank_addr,
 
 	if (src_offset < PAYLOAD_OFFSET) {
 		while (bytes >= 4) {
-			*dst = le32_to_cpu(__raw_readl(src));
+			*dst = readl_relaxed(src);
 			bytes -= 4;
 			src++;
 			dst++;
@@ -267,7 +267,7 @@ static void bank_reads8(void __iomem *src_base, u32 src_offset, u32 bank_addr,
 	 * allocated.
 	 */
 	if (src_offset < PAYLOAD_OFFSET)
-		val = le32_to_cpu(__raw_readl(src));
+		val = readl_relaxed(src);
 	else
 		val = __raw_readl(src);
 
@@ -301,7 +301,7 @@ static void mem_writes8(void __iomem *dst_base, u32 dst_offset,
 
 	if (dst_offset < PAYLOAD_OFFSET) {
 		while (bytes >= 4) {
-			__raw_writel(cpu_to_le32(*src), dst);
+			writel_relaxed(*src, dst);
 			bytes -= 4;
 			src++;
 			dst++;
@@ -322,7 +322,7 @@ static void mem_writes8(void __iomem *dst_base, u32 dst_offset,
 	 */
 
 	if (dst_offset < PAYLOAD_OFFSET)
-		__raw_writel(cpu_to_le32(*src), dst);
+		writel_relaxed(*src, dst);
 	else
 		__raw_writel(*src, dst);
 }