clk: mediatek: support COMMON_CLK_MT8192 module build

[Miles Chen]

This patch set supports COMMON_CLK_MT8192 module build.
Boot-up tested with builtin and module build:

load test:
clk_mt8192_venc 16384 0 - Live 0xffff800008ff7000
clk_mt8192_vdec 16384 0 - Live 0xffff800008fef000
clk_mt8192_scp_adsp 16384 0 - Live 0xffff800008fe7000
clk_mt8192_msdc 16384 0 - Live 0xffff800008fdf000
clk_mt8192_mm 16384 0 - Live 0xffff800008fda000
clk_mt8192_mfg 16384 0 - Live 0xffff800008fd5000
clk_mt8192_mdp 16384 0 - Live 0xffff800008fd0000
clk_mt8192_ipe 16384 0 - Live 0xffff800008fcb000
clk_mt8192_imp_iic_wrap 16384 0 - Live 0xffff800008fc6000
clk_mt8192_img 16384 0 - Live 0xffff800008fc1000
clk_mt8192_cam 16384 0 - Live 0xffff800008fbc000
clk_mt8192_aud 16384 0 - Live 0xffff800008fb7000
clk_mt8192 40960 0 [permanent], Live 0xffff800008fa8000