components/liveinstall: Support all expected architectures properly

We want to be able to produce live ISOs for AArch64 and POWER with
the correct GRUB configuration. This also sets us up to handle any
quirks for each architecture platform as needed later.

This also includes a change to bump the EFI partition size for ISOs
to 30MB so everything fits.

grub-ppc.cfg.iso-template

@@ -0,0 +1,26 @@
+# Inspired by the config used for lorax-built live media
+
+set default=${default_boot}
+
+insmod gzio
+insmod part_gpt
+insmod ext2
+
+terminal_input console
+terminal_output ${terminal_output}
+
+set timeout=${boot_timeout}
+set timeout_style=${boot_timeout_style}
+
+search ${search_params}
+
+menuentry "Start ${title}" --class fedora --class gnu-linux --class gnu --class os {
+	linux ($$root)${bootpath}/${kernel_file} ${boot_options}
+	initrd ($$root)${bootpath}/${initrd_file}
+}
+submenu "Troubleshooting -->" {
+	menuentry "Start ${title} in basic graphics mode" --class fedora --class gnu-linux --class gnu --class os {
+		linux ($$root)${bootpath}/${kernel_file} ${boot_options} $${basicgfx}
+		initrd ($$root)${bootpath}/${initrd_file}
+	}
+}