wifi: brcmfmac: Add optional lpo clock enable support

wifi: brcmfmac: Add optional lpo clock enable support

WiFi modules often require 32kHz clock to function. Add support to
enable the clock to PCIe driver and move "brcm,bcm4329-fmac" check
to the top of brcmf_of_probe. Change function prototypes from void
to int and add appropriate errno's for return values that will be
send to bus when error occurred.

Co-developed-by: Ondrej Jirman <megi@xff.cz>
Signed-off-by: Ondrej Jirman <megi@xff.cz>
Co-developed-by: Arend van Spriel <arend.vanspriel@broadcom.com>
Signed-off-by: Arend van Spriel <arend.vanspriel@broadcom.com>
Reviewed-by: Sai Krishna <saikrishnag@marvell.com>
Signed-off-by: Jacobe Zang <jacobe.zang@wesion.com>
Reviewed-by: Sebastian Reichel <sebastian.reichel@collabora.com>
Tested-by: Sebastian Reichel <sebastian.reichel@collabora.com> # On RK3588 EVB1
Acked-by: Arend van Spriel <arend.vanspriel@broadcom.com>
Signed-off-by: Kalle Valo <kvalo@kernel.org>
Link: https://patch.msgid.link/20240910-wireless-mainline-v14-3-9d80fea5326d@wesion.com