configs/qemu_ppc_mac99_defconfig: add usual comments for Kconfig symbols

This defconfig was generated by savedefconfig but we usually
use a manually modified defconfig to add some comments for
Kconfig symbols.

No content change intended.

Signed-off-by: Romain Naour <romain.naour@smile.fr>
Cc: Joel Stanley <joel@jms.id.au>
Acked-by: Joel Stanley <joel@jms.id.au>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

configs/qemu_ppc_mac99_defconfig

@@ -1,8 +1,14 @@
+# Architecture
 BR2_powerpc=y
 BR2_powerpc_7400=y
-BR2_TARGET_GENERIC_GETTY_PORT="ttyS0"
+
+# System
 BR2_SYSTEM_DHCP="eth0"
+
+# Linux headers same as kernel, a 5.2 series
 BR2_PACKAGE_HOST_LINUX_HEADERS_CUSTOM_5_2=y
+
+# Kernel
 BR2_LINUX_KERNEL=y
 BR2_LINUX_KERNEL_CUSTOM_VERSION=y
 BR2_LINUX_KERNEL_CUSTOM_VERSION_VALUE="5.2.4"
@@ -10,6 +16,11 @@ BR2_LINUX_KERNEL_DEFCONFIG="pmac32"
 BR2_LINUX_KERNEL_CONFIG_FRAGMENT_FILES="board/qemu/ppc-mac99/linux.fragment"
 BR2_LINUX_KERNEL_VMLINUX=y
 BR2_LINUX_KERNEL_NEEDS_HOST_OPENSSL=y
+
+# Serial port config
+BR2_TARGET_GENERIC_GETTY_PORT="ttyS0"
+
+# Filesystem
 BR2_TARGET_ROOTFS_CPIO=y
 BR2_TARGET_ROOTFS_EXT2=y
 # BR2_TARGET_ROOTFS_TAR is not set