mips: replace cpu_mips_init() with cpu_generic_init()

mips: replace cpu_mips_init() with cpu_generic_init()

now cpu_mips_init() reimplements subset of cpu_generic_init()
tasks, so just drop it and use cpu_generic_init() directly.

Signed-off-by: Igor Mammedov <[email protected]>
Reviewed-by: Hervé Poussineau <[email protected]>
Signed-off-by: Philippe Mathieu-Daudé <[email protected]>
[PMD: use internal.h instead of cpu.h]
Tested-by: James Hogan <[email protected]>
Reviewed-by: Eduardo Habkost <[email protected]>
Signed-off-by: Yongbok Kim <[email protected]>