log: Fix number of parameters of APP_UART_INIT() macro
ll: Add ll_set_advertising_data() API
ll: Add ll_set_scan_response_data() API
bci: Add bci_set_scan_response_data() API
platform/nrf51822/log: Improve buffer length calculation
log: Add volatile modifier

Inform the compiler that the variable can be modified at any time externally
to the implementation, for example, by the operating system, by other thread
such as an interrupt routine or signal handler, or by hardware.
log: Minor code cleanup
log: Add aligned modifier

Use the maximum alignment for a scalar data type.
radio: Add volatile modifier to "status"
build: Add -O2 flag
ll: Add comments for advertising header
example: Fix length field of broadcaster example
radio: Force alignment

Force maximum alignment for a scalar data type in order to have a better
efficiency when handling memory/data copy.
radio: Use macro instead of magic number

This commit doesn't change the logic. It is replacing a "magic" number by
a constant defined in the NRF51 sdk.
radio: Minor coding style change
radio: Fix NRF PCNF0 config

In-RAM representation of radio packet, S0, LENGTH, and S1 are optional.
For BTLE radio packet, S1 can be omitted setting its length to zero
(omitting in memory).
radio: Remove unneeded buffer copy

memcpy should be avoided at all. Buffer address can be assigned directly
to NRF_RADIO->PACKETPTR register.

This way, provided buffers must be non-const because Radio's EastDMA
requires an address in the RAM.
radio: Remove unneeded radio_packet struct

Copy packets between layers should not be encouraged. Even using newlib
memcpy implementation, each memory copy of the radio packets can take
more than 10us.
ll: Remove unneeded type definition

Advertising PDUs will not be exposed to the upper/down layers, it will
be restricted to ll.c source file. Even if it was declared in a header
file typedef'd structs pollutes the global namespace and may cause
ordering relationships among header files.
ll: Remove unneeded static variable