arm64: versal2: Move board_early_init_r clock setup to mach code

board_early_init_r() programmed the IOU switch clock and the system
timestamp counter directly with readl()/writel() in board code. This is
SoC register setup rather than board policy, and the same block is
duplicated across the Xilinx SoCs.

Move it into versal2_timer_setup() in arch/arm/mach-versal2 so the board
hook only keeps the EL3 guard and calls the helper.

Signed-off-by: Michal Simek <[email protected]>
Link: https://patch.msgid.link/08e835a183c39de6f666375ac390eee6a8f3f12e.1782219202.git.michal.simek@amd.com

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