wifi: rtw89: regd: extend policy of UNII-4 for IC regulatory

Originally, we have an ACPI function to determine whether to enable UNII-4.
Since IC (Industry Canada) has allowed UNII-4, the ACPI result is extended
to be two bits as below.
  * BIT(0): determine if rtw89_regd::FCC enable UNII-4
  * BIT(1): determine if rtw89_regd::IC enable UNII-4

Besides, to take old platforms into account, we enable UNII-4 on IC if and
only if BIOS configuration enable it.

Signed-off-by: Zong-Zhe Yang <kevin_yang@realtek.com>
Signed-off-by: Ping-Ke Shih <pkshih@realtek.com>
Link: https://msgid.link/20240412115729.8316-7-pkshih@realtek.com