Strip debugging symbols from installed wifi modules

This saves several MB in the installed system.

Change-Id: Iad35f73de5ebea171b96e654f4d0b3f3a72163e8
Lock the CPU clock speed to 1 GHz as early as possible

This reduces the amount of time the CPU is running at higher clock
speeds during early boot.

Change-Id: I01f141133a943d52b772e792c7547a7897d22266
Add a new power HAL

This very simple power HAL pins the L3 (memory) bus clock speed to the
max only while the screen is on, allowing us to benefit from improved
graphics performance without using power unnecessarily while the screen
is off.

Change-Id: Ib9f65fdd98e7dcec679f5a13878ff6033674fdb2