Make now is building out of the box.

[cbalint13]

Hi Mathew !

This PR address:

• clean up all spurious end-line trailing spaces.
• make build out of the box on any distro also recent kernels.
• use chips internal SPI parameters in all transactions.
• add optional debug module parameter.

For best review PR is composed of 4 consecutive commits.

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On Fedora 33

[cbalint@yoda ~]$ rpm -qa kernel-devel
kernel-devel-5.8.1-300.fc33.x86_64

Bulding requires a simple make:

[root@yoda mcp2210-linux]# make
make -C /lib/modules/5.8.1-300.fc33.x86_64/build M=/home/cbalint/work/mcp2210-kernel/mcp2210-linux modules
make[1]: Entering directory '/usr/src/kernels/5.8.1-300.fc33.x86_64'
  CC [M]  /home/cbalint/work/EHV/usb-stick/mcp2210-kernel/mcp2210-linux/mcp2210-core.o
  CC [M]  /home/cbalint/work/EHV/usb-stick/mcp2210-kernel/mcp2210-linux/mcp2210-spi.o
  LD [M]  /home/cbalint/work/EHV/usb-stick/mcp2210-kernel/mcp2210-linux/mcp2210.o
  MODPOST /home/cbalint/work/EHV/usb-stick/mcp2210-kernel/mcp2210-linux/Module.symvers
  CC [M]  /home/cbalint/work/EHV/usb-stick/mcp2210-kernel/mcp2210-linux/mcp2210.mod.o
  LD [M]  /home/cbalint/work/EHV/usb-stick/mcp2210-kernel/mcp2210-linux/mcp2210.ko
make[1]: Leaving directory '/usr/src/kernels/5.8.1-300.fc33.x86_64'

Kernel outputs:

[root@yoda mcp2210-linux]# dmesg 
[ 4628.057328] hid-generic 0003:04D8:00DE.0002: hiddev96,hidraw1: USB HID v1.11 Device [DeepWorks LoRA] on usb-0000:03:00.0-2/input0
[ 4630.024283] mcp2210 0003:04D8:00DE.0002: hiddev96,hidraw1: USB HID v1.11 Device [DeepWorks LoRA] on usb-0000:03:00.0-2/input0
[ 4630.075661] mcp2210 0003:04D8:00DE.0002: controller is unqueued, this is deprecated
[ 4630.075663] mcp2210 spi master registered bus number 0
[ 4630.077794] MCP2210 SPI settings: bitrate=100000(bit/s) idle_cs=001000000 active_cs=110111111 cs_ds_delay=500(us) cs_ls_delay=500(us) byte_delay=0(us) byte_per_spi=2 spi_mode=0x00

The kernel SPI dev is ready to be consumed (e.g. python spidev or favorite way):

[root@yoda mcp2210-linux]# ls -l /dev/spidev0.0 
crw------- 1 root root 153, 0 Aug 29 20:11 /dev/spidev0.0

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I am using https://github.com/lkundrak/mcp2210 tool to manipulate chip internals.
Tested on https://workspace.circuitmaker.com/Projects/Details/Cristian-Balint/USB-LoRa