ANDROID: arm: Support for extracting EAS energy costs from DT

This patch implements support in the arm architecture for extracting
energy cost data from DT and matches the support added for arm64
in "ANDROID: arm64: Support for extracting EAS energy costs from DT"

The data should conform to the DT bindings for energy cost data needed
by EAS (energy aware scheduling).

Test output on TC2:

150     187     172     275     215     334     258     407     301     447     344     549     387     761     430     1024
0       0       0
8
3
150     187     172     275     215     334     258     407     301     447     344     549     387     761     430     1024
0       0       0
8
3
150     187     172     275     215     334     258     407     301     447     344     549     387     761     430     1024
0       0       0
8
3
150     2967    172     2792    215     2810    258     2815    301     2919    344     2847    387     3917    430     4905
25      25      10
8
3
426     7920    512     8165    597     8172    682     8195    768     8265    853     8446    938     11426   1024    15200
70      70      25
8
3

Change-Id: I1f6a70917ec5f4615a57cdbb7a34f1d783901c77
Signed-off-by: Dietmar Eggemann <dietmar.eggemann@arm.com>
Signed-off-by: Chris Redpath <chris.redpath@arm.com>