arch: arm: cortex_r: linker.ld: Clean-up
arch: arm: cortex_r: linker.ld: Clean-up

This commit cleans up the linker.ld file for the Cortex-R arch.

* Convert all TAB characters to SPACE.
* Fix insane placement of curly brackets.
* Fix overall text alignments.
* Remove the special handlings for the Cortex-M devices that were
  copied from `include/arm/aarch32/cortex_m/scripts/linker.ld`.

Signed-off-by: Stephanos Ioannidis <dc76e9f0c0006e8f919e0c515c66dbba3982f785@stephanos.io>

galak/zephyr,Vudentz/zephyr,nashif/zephyr,zephyrproject-rtos/zephyr,nashif/zephyr,galak/zephyr,finikorg/zephyr,Vudentz/zephyr,galak/zephyr,finikorg/zephyr,zephyrproject-rtos/zephyr,finikorg/zephyr,Vudentz/zephyr,finikorg/zephyr,galak/zephyr,finikorg/zephyr,zephyrproject-rtos/zephyr,Vudentz/zephyr,zephyrproject-rtos/zephyr,nashif/zephyr,zephyrproject-rtos/zephyr,galak/zephyr,Vudentz/zephyr,nashif/zephyr,nashif/zephyr,Vudentz/zephyr