blaze_tablet: Switch to upstreamed OMAP4 Blaze Tablet DT machine name.

In order to be aligned with kernel change of machine name in
Device Tree, change all related configuration files name:
    *.omap44xxtabletboard.* -> *.tiomap4blazetablet.*

Change-Id: I4903a0393b681dc61c5d942e1903ef306d31c4d0
Signed-off-by: Ruslan Bilovol <ruslan.bilovol@ti.com>