brcm: Update Raspberry Pi 3B+/4B NVRAM for downstream changes

The Raspberry Pi Foundation NVRAM files have been updated for a new
BT/WiFi coexistence parameter for firmwares newer than 177, now
we have new firmwares (7.45.221) from Cypress for the BCM43455
update the NVRAM for these parameters.

Update the RPi4B NVRAM boardflags3 parameter to match too, which
also happens to be what we already have for the RPi3B+.
Signed-off-by: Peter Robinson <pbrobinson@gmail.com>
Cc: Matthias Brugger <mbrugger@suse.com>
Signed-off-by: Josh Boyer <jwboyer@kernel.org>

brcm/brcmfmac43455-sdio.raspberrypi,3-model-b-plus.txt

@@ -13,6 +13,7 @@ boardtype=0x6e4
 btc_mode=1
 btc_params1=0x7530
 btc_params8=0x4e20
+btc_params50=0x972c
 cbfilttype=1
 cckPwrIdxCorr=3
 cckTssiDelay=150

brcm/brcmfmac43455-sdio.raspberrypi,4-model-b.txt

@@ -7,12 +7,13 @@ aa5g=1
 AvVmid_c0=1,165,2,100,2,100,2,100,2,100
 boardflags=0x00480201
 boardflags2=0x40800000
-boardflags3=0x44200100
+boardflags3=0x48200100
 boardrev=0x1304
 boardtype=0x6e4
 btc_mode=1
 btc_params1=0x7530
 btc_params8=0x4e20
+btc_params50=0x972c
 cbfilttype=1
 cckPwrIdxCorr=3
 cckTssiDelay=150