[CEC Configuration] Rename 1_4_b to 1_4_B

SystemApi complains:
error: Constant field names must be named with only upper case characters:
`android.hardware.hdmi.HdmiControlManager#HDMI_CEC_VERSION_1_4_b`,
should be `HDMI__CEC__VERSION_1_4_B`

Bug: 174731501
Bug: 172637440
Test: atest com.google.android.gts.hdmicec.HdmiControlManagerHostTest
Change-Id: Ia1bfdb44e704c99fa574663f658a2173f6b48d21