Documentation/kernel-parameters: add missing pciserial to the earlyprintk

The PCI based UART can be specified for earlyprintk with the 'pciserial'
parameter from the ea9e9d80. This patch adds missing information about
this parameter.
Signed-off-by: NAlexander Kuleshov <kuleshovmail@gmail.com>
Signed-off-by: NJonathan Corbet <corbet@lwn.net>

Documentation/kernel-parameters.txt

@@ -1009,6 +1009,7 @@ bytes respectively. Such letter suffixes can also be entirely omitted.
 			earlyprintk=serial[,0x...[,baudrate]]
 			earlyprintk=ttySn[,baudrate]
 			earlyprintk=dbgp[debugController#]
+			earlyprintk=pciserial,bus:device.function[,baudrate]
 
 			earlyprintk is useful when the kernel crashes before
 			the normal console is initialized. It is not enabled by