Add new connection type 'piplate' to the hd44780 driver (by J. Brogdon).

In the documentation replace the list of the connection types for hd44780
driver with the table also used in the configuration options description
(use only a single place to list and link everyting). While there, remove the
assembly code for lcdserializer.

server/drivers/hd44780-drivers.h

@@ -31,6 +31,7 @@
 #endif
 #ifdef HAVE_I2C
 # include "hd44780-i2c.h"
+# include "hd44780-piplate.h"
 #endif
 #ifdef WITH_ETHLCD
 # include "hd44780-ethlcd.h"
@@ -80,6 +81,7 @@ static const ConnectionMapping connectionMapping[] = {
 	/* I2C connection types */
 #ifdef HAVE_I2C
 	{ "i2c",           HD44780_CT_I2C,           IF_TYPE_I2C,     hd_init_i2c       },
+        { "piplate",       HD44780_CT_PIPLATE,       IF_TYPE_I2C,     hd_init_i2c_piplate },
 #endif
 	/* TCP socket connection types */
 #ifdef WITH_ETHLCD