mac80211: brcmfmac: rename 4.20 backport patches

Include kernel version to help tracking changes.

Signed-off-by: Rafał Miłecki <rafal@milecki.pl>

diff --git a/package/kernel/mac80211/patches/brcm/342-0001-brcmfmac-add-CYW89342-mini-PCIe-device.patch b/package/kernel/mac80211/patches/brcm/300-v4.20-0001-brcmfmac-add-CYW89342-mini-PCIe-device.patch
similarity index 100%
rename from package/kernel/mac80211/patches/brcm/342-0001-brcmfmac-add-CYW89342-mini-PCIe-device.patch
rename to package/kernel/mac80211/patches/brcm/300-v4.20-0001-brcmfmac-add-CYW89342-mini-PCIe-device.patch

diff --git a/package/kernel/mac80211/patches/brcm/344-0001-brcmfmac-fix-wrong-strnchr-usage.patch b/package/kernel/mac80211/patches/brcm/302-v4.20-0001-brcmfmac-fix-wrong-strnchr-usage.patch
similarity index 100%
rename from package/kernel/mac80211/patches/brcm/344-0001-brcmfmac-fix-wrong-strnchr-usage.patch
rename to package/kernel/mac80211/patches/brcm/302-v4.20-0001-brcmfmac-fix-wrong-strnchr-usage.patch

diff --git a/package/kernel/mac80211/patches/brcm/345-0001-brcmfmac-fix-for-proper-support-of-160MHz-bandwidth.patch b/package/kernel/mac80211/patches/brcm/304-v4.20-0001-brcmfmac-fix-for-proper-support-of-160MHz-bandwidth.patch
similarity index 100%
rename from package/kernel/mac80211/patches/brcm/345-0001-brcmfmac-fix-for-proper-support-of-160MHz-bandwidth.patch
rename to package/kernel/mac80211/patches/brcm/304-v4.20-0001-brcmfmac-fix-for-proper-support-of-160MHz-bandwidth.patch

diff --git a/package/kernel/mac80211/patches/brcm/345-0002-brcmfmac-increase-buffer-for-obtaining-firmware-capa.patch b/package/kernel/mac80211/patches/brcm/304-v4.20-0002-brcmfmac-increase-buffer-for-obtaining-firmware-capa.patch
similarity index 100%
rename from package/kernel/mac80211/patches/brcm/345-0002-brcmfmac-increase-buffer-for-obtaining-firmware-capa.patch
rename to package/kernel/mac80211/patches/brcm/304-v4.20-0002-brcmfmac-increase-buffer-for-obtaining-firmware-capa.patch