Set SCI_CLOCKF as per data sheet, add defines for clock parameters #107
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Section 4.2: SCI_CLOCKF=0x8800 (SC_MULT=3.5, SC_ADD=1.0)
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This PR changes the SCI_CLOCKF register configuration to match the data sheet recommendations (section 4.2, SCI_CLOCKF=0x8800).
Also defines for associated clock parameters (SCI_CLOCKF, SLOW_SCK, FAST_SCK) are added.
Effect on VS1053B operation of this PR: The CLKI frequency of VS1053B will be increased by 0.5xXTALI. This means slightly faster operation, faster SPI, but potentially more power consumption.
This is a backwards compatible change. No need to change sketches using this library.