Spirit: Correct setting of the length width field; Add multicast and broadcast addresses to radio properities.

Spirit network driver:  Need to enable sending of TX address.  Moved some non-optional settings out of board.h to driver.

RAMTRON:  Should be able to select chunked write mode via a configuration option, not by editing the file.

RAMTRON: Add support for splitting block writes in chunks.  Some Re-RAMs like MB85AS4MT has a write buffer size limitation.

drivers: handle I2C_TRANSFER return value consistently.  Some I2C peripherals transfers return zero on success, others number of completed transfers. Make drivers robust against this.

spirit:  Modify reg needs to toggle CS to get the correct status.  Remove some delbug left in last commit.  make sprit_unlock an inline function.

poll: fix poll for regular files and block devices.  Open Group documentation tells that poll (and select) support regular files and that 'Regular files shall always poll TRUE for reading and writing'.

Spirit: Fix typos in conditional compilation. Add debug output.  Remove extra clear of pending interrupts, could cause missing interrupts.  Add spirit_reg_modify() which is not currently used.

Spirit Network Device:  Fix a deadlock.  Also several other design improvements to eliminate corner cases.

Fix for stm32f746g-disco board for button support with interrupt. This change is tested with buttons app example and it is working with interrupts (signals). I tried the test with polling but at this point it doesn't work.

b-l475e-iot91a:  Add apps/examples/nettest and eamples/udp to Spirit1 configuration.  Add telnet support.  fix driver statistics configuration.

lc823450 support

Approved-by: Gregory Nutt <gnutt@nuttx.org>

Signed-off-by: Masayuki Ishikawa <Masayuki.Ishikawa@jp.sony.com>

Signed-off-by: Masayuki Ishikawa <Masayuki.Ishikawa@jp.sony.com>

Spirit: Network driver needs to setup IP address based on configured node address.  If no node address is provided, then it will use a default.  Also upate a README.

Spirit:  Add more debug output.  Make sure device is in READY state after reset and before changing to STANDBY.

NX PR

Approved-by: Gregory Nutt <gnutt@nuttx.org>

stm32f746g-disco:  Make the initialization logic identical to the standard way that is done for all other board.