Add AVR32EBxx parts

[stefanrueger]

Fixes #1931

@askn37 Could you please review this PR? Thanks

[askn37]

The summary of the added parts seems fine. Thanks.

avrdude_avr32eb % ./build_darwin/src/avrdude -pavr32eb\*/st
.pt	AVR32EB14	desc	"AVR32EB14"
.pt	AVR32EB14	id	"32eb14"
.pt	AVR32EB14	variants	"AVR32EB14-SOIC/TSSOP: SOIC14, Fmax=20 MHz, T=[-40 C, 125 C], Vcc=[1.8 V, 5.5 V]"
.pt	AVR32EB14	mcuid	398
.pt	AVR32EB14	signature	0x1e 0x95 0x2d
.ptmm	AVR32EB14	flash	size	0x8000
.ptmm	AVR32EB14	sram	size	3072
.ptmm	AVR32EB14	sram	offset	0x7400

.pt	AVR32EB20	desc	"AVR32EB20"
.pt	AVR32EB20	id	"32eb20"
.pt	AVR32EB20	variants	"AVR32EB20-SSOP: SOIC20, Fmax=20 MHz, T=[-40 C, 125 C], Vcc=[1.8 V, 5.5 V]"
.pt	AVR32EB20	mcuid	399
.pt	AVR32EB20	signature	0x1e 0x95 0x2c
.ptmm	AVR32EB20	flash	size	0x8000
.ptmm	AVR32EB20	sram	size	3072
.ptmm	AVR32EB20	sram	offset	0x7400

.pt	AVR32EB28	desc	"AVR32EB28"
.pt	AVR32EB28	id	"32eb28"
.pt	AVR32EB28	variants	"AVR32EB28-SSOP/SPDIP: SOIC28, Fmax=20 MHz, T=[-40 C, 125 C], Vcc=[1.8 V, 5.5 V]", "AVR32EB28-VQFN:       VQFN28, Fmax=20 MHz, T=[-40 C, 125 C], Vcc=[1.8 V, 5.5 V]"
.pt	AVR32EB28	mcuid	400
.pt	AVR32EB28	signature	0x1e 0x95 0x2b
.ptmm	AVR32EB28	flash	size	0x8000
.ptmm	AVR32EB28	sram	size	3072
.ptmm	AVR32EB28	sram	offset	0x7400

.pt	AVR32EB32	desc	"AVR32EB32"
.pt	AVR32EB32	id	"32eb32"
.pt	AVR32EB32	variants	"AVR32EB32-VQFN/TQFP: VQFN32, Fmax=20 MHz, T=[-40 C, 125 C], Vcc=[1.8 V, 5.5 V]"
.pt	AVR32EB32	mcuid	401
.pt	AVR32EB32	signature	0x1e 0x95 0x2a
.ptmm	AVR32EB32	flash	size	0x8000
.ptmm	AVR32EB32	sram	size	3072
.ptmm	AVR32EB32	sram	offset	0x7400