hw/i386: Introduce X86_FW_OVMF Kconfig symbol

Introduce the X86_FW_OVMF Kconfig symbol for OVMF-specific code.
Move the OVMF-specific code from pc_sysfw.c to pc_sysfw_ovmf.c,
adding a pair of stubs.
Update MAINTAINERS to reach OVMF maintainers when these new
files are modified.

This fixes when building the microvm machine standalone:

  /usr/bin/ld: libqemu-i386-softmmu.fa.p/target_i386_monitor.c.o: in
  function `qmp_sev_inject_launch_secret':
  target/i386/monitor.c:749: undefined reference to `pc_system_ovmf_table_find'

Fixes: f522cef9b35 ("sev: update sev-inject-launch-secret to make gpa optional")
Signed-off-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Acked-by: Michael S. Tsirkin <mst@redhat.com>
Message-Id: <20210616204328.2611406-22-philmd@redhat.com>
diff --git a/MAINTAINERS b/MAINTAINERS
index 148153d..2250cd1 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -2945,6 +2945,7 @@
 M: Laszlo Ersek <lersek@redhat.com>
 M: Philippe Mathieu-Daudé <philmd@redhat.com>
 S: Supported
+F: hw/i386/*ovmf*
 F: pc-bios/descriptors/??-edk2-*.json
 F: pc-bios/edk2-*
 F: roms/Makefile.edk2