[fb] Create fb driver

Create a new framebuffer driver. Also hackily passing frame buffer size
in the list of init handles to all processes and mapping the framebuffer
into all processes. Changed bootloader passing frame buffer as a module
to its own struct.

scripts/templates/build.ninja.j2

@@ -190,6 +190,9 @@ build $builddir/fatroot/efi/boot/bootx64.efi : cp $builddir/boot/boot.efi
 build $builddir/fatroot/nulldrv.elf : cp $builddir/user/nulldrv.elf
     name = null driver to FAT image
 
+build $builddir/fatroot/fb.elf : cp $builddir/user/fb.elf
+    name = fb driver to FAT image
+
 build $builddir/fatroot/terminal.elf : cp $builddir/user/nulldrv.elf
     name = terminal driver to FAT image
 
@@ -198,6 +201,7 @@ build ${builddir}/fatroot/symbol_table.dat : makest ${builddir}/jsix.elf
 build $builddir/jsix.img : makefat | $
     $builddir/fatroot/symbol_table.dat $
     $builddir/fatroot/nulldrv.elf $
+    $builddir/fatroot/fb.elf $
     $builddir/fatroot/terminal.elf $
     $builddir/fatroot/jsix.elf $
     $builddir/fatroot/efi/boot/bootx64.efi