sunxi: remove kmod-rtc-sunxi for unsupported devices

sunxi: remove kmod-rtc-sunxi for unsupported devices

From driver source:

	{ .compatible = "allwinner,sun4i-a10-rtc", .data =
	&data_year_param[0] },
	{ .compatible = "allwinner,sun7i-a20-rtc", .data =
	&data_year_param[1] },

The rtc-sunxi module only supports allwinner a10 and a20 SoCs,
other SoCs in the cortexa7 and cortexa53 subtarget using the
CONFIG_RTC_DRV_SUN6I driver which is compiled into the kernel
binary, so remove this package for these unsupported devices.

Signed-off-by: Chukun Pan <amadeus@jmu.edu.cn>