clk: at91: Read "reg" with helper

The "reg" property is an address-sized DT cell property. The AT91
compat clock parser only uses a small bus id from it, but reading it
with the u8 helper does not match the property encoding.

Use of_property_read_reg() so the code goes through the helper for
"reg" properties, then keep the existing range check before passing
the bus id to the clock registration code.

Assisted-by: Codex:gpt-5-5
Signed-off-by: Rob Herring (Arm) <robh@kernel.org>
Reviewed-by: Brian Masney <bmasney@redhat.com>
Link: https://patch.msgid.link/20260612215251.1888345-1-robh@kernel.org
Signed-off-by: Claudiu Beznea <claudiu.beznea@tuxon.dev>

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