slimbus: core: Constify slim_eaddr_equal()

slimbus: core: Constify slim_eaddr_equal()

bool slim_eaddr_equal(struct slim_eaddr *a, struct slim_eaddr *b)
does not modify @*a or @*b.

To prepare for constifying API device_find_child() later.

Constify this comparison function by simply changing its
parameter type to 'const struct slim_eaddr *'.

Reviewed-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Signed-off-by: Zijun Hu <quic_zijuhu@quicinc.com>
Link: https://lore.kernel.org/r/20241224-const_dfc_done-v5-2-6623037414d4@quicinc.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>