Switch to Image target for kernel on RISC-V

Starting 5.3 kernel Image and Image.gz incl. 64 bytes header for
bootloaders. For example this can be used with U-Boot booti command,
which currently doesn't support compressed Image.gz. This also means
that we do not need to wrap kernel and initramfs for U-Boot.

Signed-off-by: David Abdurachmanov <david.abdurachmanov@sifive.com>

kernel.spec

@@ -311,8 +311,8 @@ Summary: The Linux kernel
 %define all_arch_configs kernel-%{version}-riscv64*.config
 %define asmarch riscv
 %define hdrarch riscv
-%define make_target Image.gz
-%define kernel_image arch/riscv/boot/Image.gz
+%define make_target Image
+%define kernel_image arch/riscv/boot/Image
 %endif