Add IR speed codes

These are very important to use IR and missing from official headers and docs.

localTester/3dsIrForwarder/3dsIrBitRateCodes.txt

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+3DS IR speed codes(there missing from libctru headers and docs):
+https://www.3dbrew.org/wiki/IRU:SetBitRate
+
+Bitrate Values
+Value    Converted divisor value    Bits-per-second / description
+3     10    115200
+4     12    96000
+5     16    72000
+6     24    48000 (This is the default for IRU)
+7     32    36000
+8     48    24000
+9     64    18000
+10    96    12000
+11    120    9600
+12    192    6000
+13    384    3000
+14    20    57600
+15    30    38400
+16    60    19200
+17    160    7200
+18    240    4800
+
+The bps listed above is from code in IR module which converts the input value into actual bps, that function is only used with delay code however.
+
+The converted value is the following(from a datasheet): "16-bit divisor for generation of the baud clock in the baud rate generator". The baud/bit rate is calculated with the following, where clk is 1152000: bitrate = clk / divisor.