Fishfooding: linux-firmware: add a build flag for RTL8822C

This change updates LINUX_FIRMWARE (which expends into a USE flag)
in order to pick the correct Bluetooth firmware file on RTL8822C.

Once the CL in the ToT is merged, this one should be reverted then
re-apply the formal merged one in the ToT.

BUG=b:139078086
TEST=Manually run with and without the chages (and depedencies), and
verify that the FW was loaded correctly.
Original-Cq-Depend: chromium:1692343
Original-Change-Id: I8d86b308f54b1bb6adc72a3571d14729cb09e229

Change-Id: I9d63673b4bc043dc14f3553b86139a367ccb5efa
diff --git a/sys-kernel/linux-firmware/linux-firmware-9999.ebuild b/sys-kernel/linux-firmware/linux-firmware-9999.ebuild
index 35c2464..317d5f0 100644
--- a/sys-kernel/linux-firmware/linux-firmware-9999.ebuild
+++ b/sys-kernel/linux-firmware/linux-firmware-9999.ebuild
@@ -85,6 +85,7 @@
 	rt2870
 	rtl8168g-1
 	rtl8168g-2
+	rtl_bt-8822c
 	rtw8822c
 	venus-52
 	"${IUSE_ATH3K[@]}"
@@ -130,6 +131,7 @@
 	linux_firmware_rt2870? ( LICENCE.ralink-firmware.txt LICENCE.ralink_a_mediatek_company_firmware )
 	linux_firmware_rtl8168g-1? ( LICENCE.rtl_nic )
 	linux_firmware_rtl8168g-2? ( LICENCE.rtl_nic )
+	linux_firmware_rtl_bt-8822c? ( LICENCE.rtlwifi_firmware )
 	linux_firmware_rtw8822c? ( LICENCE.rtlwifi_firmware )
 	linux_firmware_venus-52? ( LICENSE.qcom )
 	$(printf 'linux_firmware_%s? ( LICENCE.iwlwifi_firmware ) ' "${IUSE_IWLWIFI[@]}")
@@ -224,6 +226,7 @@
 	use_fw rockchip-dptx && doins_subdir rockchip/dptx.bin
 	use_fw rtl8168g-1 && doins_subdir rtl_nic/rtl8168g-1.fw
 	use_fw rtl8168g-2 && doins_subdir rtl_nic/rtl8168g-2.fw
+	use_fw rtl_bt-8822c && doins_subdir rtl_bt/rtl8822c*.bin
 	use_fw rtw8822c && doins_subdir rtw88/rtw8822c*.bin
 	use_fw venus-52 && doins_subdir qcom/venus-5.2/*
 	use video_cards_radeon && doins_subdir radeon/*