rtc: mcp795: Prefer using the BIT() macro.

This patch doesn't change the code but replaces all bitmask values
with the BIT(x) macro.
Signed-off-by: Emil Bartczak <emilbart@gmail.com>
Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>

drivers/rtc/rtc-mcp795.c

@@ -45,8 +45,8 @@
 #define MCP795_REG_MONTH	0x06
 #define MCP795_REG_CONTROL	0x08
 
-#define MCP795_ST_BIT	0x80
-#define MCP795_24_BIT	0x40
+#define MCP795_ST_BIT	BIT(7)
+#define MCP795_24_BIT	BIT(6)
 #define MCP795_LP_BIT	BIT(5)
 #define MCP795_EXTOSC_BIT	BIT(3)
 #define MCP795_OSCON_BIT	BIT(5)