drivers: virtualization: sort Kconfig and CMaKe includes

Use the # zephyr-keep-sorted-start/stop comment to have CI check
the alphabetical order of includes, to help reducing the chance
of conflicts while contributing drivers.

Signed-off-by: Josuah Demangeon <me@josuah.net>

Author: josuah

drivers/virtualization/CMakeLists.txt

@@ -6,7 +6,8 @@ zephyr_syscall_header(
 
 zephyr_library()
 
-zephyr_library_sources_ifdef(CONFIG_IVSHMEM		virt_ivshmem.c)
-zephyr_library_sources_ifdef(CONFIG_IVSHMEM_SHELL	virt_ivshmem_shell.c)
-
-zephyr_library_sources_ifdef(CONFIG_USERSPACE		virt_ivshmem_handlers.c)
+# zephyr-keep-sorted-start
+zephyr_library_sources_ifdef(CONFIG_IVSHMEM virt_ivshmem.c)
+zephyr_library_sources_ifdef(CONFIG_IVSHMEM_SHELL virt_ivshmem_shell.c)
+zephyr_library_sources_ifdef(CONFIG_USERSPACE virt_ivshmem_handlers.c)
+# zephyr-keep-sorted-stop