realtek: arch: rtl-otto: change to __raw reads and writes

realtek: arch: rtl-otto: change to __raw reads and writes

The realtek target uses the readl and writel for register access to
switchcore and SoC bases. This works but if at some point the target
wants to enable CONFIG_SWAP_IO_SPACE, the register access breaks as
readl/writel would be operating in little endian as opposed to native.

Fix it by replacing the readl/writel used in register access macros to
a __raw variant which aligns with what upstream use for native endian
access to registers.

Signed-off-by: Rustam Adilov <adilov@tutamail.com>
Link: https://github.com/openwrt/openwrt/pull/23206
Signed-off-by: Markus Stockhausen <markus.stockhausen@gmx.de>