sys-fs/bcachefs-kmod: update LICENSE, drop unnecessary declarations

We don't have to list the crate licenses, as they are not relevant for
the kernel module. Also drop the explicit definition of src_install()
and pkg_postinst() because linux-mod-r1.eclass exports those functions.

Finally address some minor style issues.

Signed-off-by: Florian Schmaus <flow@gentoo.org>

sys-fs/bcachefs-kmod/bcachefs-kmod-1.34.0.ebuild

@@ -1,4 +1,4 @@
-# Copyright 1999-2025 Gentoo Authors
+# Copyright 1999-2026 Gentoo Authors
 # Distributed under the terms of the GNU General Public License v2
 
 EAPI=8
@@ -27,18 +27,15 @@ fi
 S="${WORKDIR}/${MY_PN}-${PV}"
 
 LICENSE="GPL-2"
-# Dependent crate licenses
-LICENSE+=" Apache-2.0 BSD ISC MIT Unicode-DFS-2016"
 SLOT="0"
 
 IUSE="debug verify-sig"
 
-RDEPEND="${DEPEND}
-"
-
-BDEPEND=">=sys-kernel/linux-headers-6.16
+BDEPEND="
+	>=sys-kernel/linux-headers-6.16
 	verify-sig? ( >=sec-keys/openpgp-keys-kentoverstreet-20241012 )
 "
+
 pkg_setup() {
 	local CONFIG_CHECK="
 		BLOCK
@@ -113,11 +110,3 @@ src_compile() {
 
 	linux-mod-r1_src_compile
 }
-
-src_install() {
-	linux-mod-r1_src_install
-}
-
-pkg_postinst() {
-	linux-mod-r1_pkg_postinst
-}