Limit main CPU to 900 MHz and set "sdram_freq" / "core_freq" as in pre-Jessie.
Limit main CPU to 900 MHz and set "sdram_freq" / "core_freq" as in pre-Jessie.

Issue #573.

jpoirier/stratux,lukepalmer/stratux,timami/PlaneSense,lukepalmer/stratux,westphae/stratux,jpoirier/stratux,westphae/stratux,jpoirier/stratux,timami/stratux,timami/stratux,cyoung/stratux,cyoung/stratux,cyoung/stratux,jpoirier/stratux,timami/PlaneSense,lukepalmer/stratux,timami/stratux,timami/stratux,westphae/stratux,timami/PlaneSense,lukepalmer/stratux,lukepalmer/stratux,westphae/stratux,jpoirier/stratux,timami/stratux,timami/PlaneSense,westphae/stratux,timami/PlaneSense,jpoirier/stratux,timami/PlaneSense,lukepalmer/stratux,timami/stratux,westphae/stratux,cyoung/stratux,cyoung/stratux,cyoung/stratux