tty: vt: define a common enum for VESA blanking constants

There are currently two places with VESA blanking constants definitions:
fb.h and console.h. Extract/unify the two to a separate header (vesa.h).

Given the fb's is in an uapi header, create the common header in uapi
too.

Note that instead of macros, an enum (vesa_blank_mode) is created. But
the macros are kept too (they now expand to the enum constants), just in
case someone in userspace performs some #ifdeffery.

Signed-off-by: "Jiri Slaby (SUSE)" <[email protected]>
Cc: Helge Deller <[email protected]>
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Cc: Thomas Zimmermann <[email protected]>
Tested-by: Helge Deller <[email protected]> # parisc STI console
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Greg Kroah-Hartman <[email protected]>

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