package/petitboot: prefer kexec-lite on powerpc

This is a better choice on platforms where it is available, so default
to it. Still select kexec for platforms where kexec-lite is not
available.

While we're at it, make use of the new
BR2_PACKAGE_KEXEC_LITE_ARCH_SUPPORTS symbol instead of relying of the
kexec-lite arch depends being a subject of kexec.

While we're at it, sort all run-time dependencies alphabetically and
don't repeat the comment.

Signed-off-by: Reza Arbab <arbab@linux.ibm.com>
[Arnout:
 - use BR2_PACKAGE_KEXEC_LITE_ARCH_SUPPORTS;
 - still allow full kexec by turning around the dependency;
 - extend commit message.
]
Signed-off-by: Arnout Vandecappelle <arnout@mind.be>

package/petitboot/Config.in

@@ -1,7 +1,6 @@
 config BR2_PACKAGE_PETITBOOT
 	bool "petitboot"
-	# kexec-lite arch depends is a subset of kexec arch depends
-	depends on BR2_PACKAGE_KEXEC_ARCH_SUPPORTS
+	depends on BR2_PACKAGE_KEXEC_ARCH_SUPPORTS || BR2_PACKAGE_KEXEC_LITE_ARCH_SUPPORTS
 	depends on BR2_USE_MMU # lvm2
 	depends on BR2_USE_WCHAR # elfutils
 	depends on !BR2_STATIC_LIBS # elfutils, lvm2
@@ -10,12 +9,11 @@ config BR2_PACKAGE_PETITBOOT
 	select BR2_PACKAGE_ELFUTILS
 	select BR2_PACKAGE_LVM2 # devmapper
 	select BR2_PACKAGE_NCURSES
-	# run-time dependency only
-	select BR2_PACKAGE_KEXEC if !BR2_PACKAGE_KEXEC_LITE
-	# run-time dependency only
-	select BR2_PACKAGE_POWERPC_UTILS if ( BR2_powerpc || BR2_powerpc64 || BR2_powerpc64le )
-	# run-time dependency only
+	# run-time dependencies
+	select BR2_PACKAGE_KEXEC if !BR2_PACKAGE_KEXEC_LITE_ARCH_SUPPORTS
+	select BR2_PACKAGE_KEXEC_LITE if BR2_PACKAGE_KEXEC_LITE_ARCH_SUPPORTS && !BR2_PACKAGE_KEXEC
 	select BR2_PACKAGE_NVME if ( BR2_powerpc || BR2_powerpc64 || BR2_powerpc64le )
+	select BR2_PACKAGE_POWERPC_UTILS if ( BR2_powerpc || BR2_powerpc64 || BR2_powerpc64le )
 	help
 	  Petitboot is a small kexec-based bootloader