syscall: use spaces in tile personality names, de-duplicate definition

syscall: use spaces in tile personality names, de-duplicate definition

As Chris Metcalf, the author of v4.7-40-g0b99a8a, told in private, there
is no strong reason for having tile's personality name different from
personality names on other architectures, so let's use spaces instead of
dashes here. And, while we are here, remove duplication of personality
name definitions for various architectures.

* syscall.c (update_personality) [defined TILE]: Change dashes to spaces
in personality names.