i2c: jz4780: Drop dependency on MACH_JZ4780

Depending on MACH_JZ4780 prevent us from creating a generic kernel that
works on more than one MIPS board. Instead, we just depend on MIPS being
set.
Signed-off-by: Paul Cercueil <paul@crapouillou.net>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>

drivers/i2c/busses/Kconfig

@@ -692,7 +692,7 @@ config I2C_IOP3XX
 
 config I2C_JZ4780
 	tristate "JZ4780 I2C controller interface support"
-	depends on MACH_JZ4780 || COMPILE_TEST
+	depends on MIPS || COMPILE_TEST
 	help
 	 If you say yes to this option, support will be included for the
 	 Ingenic JZ4780 I2C controller.