specs: clean out unneeded kernel/packages & kernel/use

None of the packages we have in boot/kernel/gentoo/packages actually
need to be build after the kernel or per-kernel.  The ones we want to
keep installed should be moved to livecd/packages in livecd-stage1.  I
have dropped sys-kernel/linux-firmware since it's already a dependency
of genkernel.

Since there will be no additional packages installed from
boot/kernel/gentoo/packages, we do not need boot/kernel/gentoo/use at
all either.

Signed-off-by: Ben Kohler <bkohler@gentoo.org>

releases/weekly/specs/sparc/sparc64/installcd-stage2-minimal.spec

@@ -19,28 +19,6 @@ boot/kernel: gentoo
 
 boot/kernel/gentoo/sources: gentoo-sources
 boot/kernel/gentoo/config: @REPO_DIR@/releases/weekly/kconfig/sparc/installcd-4.19.44.config
-boot/kernel/gentoo/use:
-	-*
-	atm
-	fbcon
-	ipv6
-	livecd
-	lvm1
-	modules
-	ncurses
-	nls
-	nptl
-	pam
-	png
-	readline
-	socks5
-	ssl
-	truetype
-	unicode
-	usb
-
-boot/kernel/gentoo/packages:
-	sys-kernel/linux-firmware
 
 livecd/unmerge:
 	app-admin/eselect