Omapconf: Array index matching

In original code, cpu_name, revision, type, performance information
arrays are initialized base upon the enum values in omap_chip and
omap_chip_revision.

As we keep adding new information, it will increase the mismatching
chances. Therefore, it will be handy if we initialize the arrays by
matching the values exactly to its corresponding indexes.

Acked-by: Nishanth Menon <nm@ti.com>
Signed-off-by: Jin Zheng <j-zheng@ti.com>