Enable bzipfs support in the EFI loader.

- Add bzipfs to the list of supported filesystems in the EFI loader.
- Increase the heap size allocated for the EFI loader from 2MB to 3MB.

Differential Revision:	https://reviews.freebsd.org/D2053
Reviewed by:	benno, emaste, imp
MFC after:	2 weeks
Sponsored by:	Cisco Systems, Inc.

sys/boot/amd64/efi/conf.c

@@ -44,6 +44,7 @@ struct fs_ops *file_system[] = {
 	&cd9660_fsops,
 	&nfs_fsops,
 	&gzipfs_fsops,
+	&bzipfs_fsops,
 	NULL
 };
 

sys/boot/efi/libefi/libefi.c

@@ -102,7 +102,7 @@ efi_main(EFI_HANDLE image_handle, EFI_SYSTEM_TABLE *system_table)
 		(void)console_control->SetMode(console_control,
 		    EfiConsoleControlScreenText);
 
-	heapsize = 2 * 1024 * 1024;
+	heapsize = 3 * 1024 * 1024;
 	status = BS->AllocatePages(AllocateAnyPages, EfiLoaderData,
 	    EFI_SIZE_TO_PAGES(heapsize), &heap);
 	if (status != EFI_SUCCESS)